NOTES ON A DIPTEROUS LARVA, BY G. KREFFT, ESQ lol 



I have subsequently attempted to breed other specimens, but 

 without success ; all my larvas went into the chrycsalis state, but 

 they always died afterwards. 



It appears that some frogs are more infested with this parasite 

 than others ; it is most common upon Cystignathus Sydney ensis 

 in this neighbourhood, a remarkable fact, as this species is the 

 smallest of the tribe and frequents the water much. 



At Shoalhaven I found Pseudophryne Bibrenii much infested, 

 some specimens not more than | in. long in the body, having from 

 2 to 4 larvae to support ; and whenever I found Hyla Citropus I 

 have always observed the larvae of a fly upon them. I believe 

 that the insect living upon Hyla Citropus will prove to be 

 diSerent from the present species, as its lai^va varies in structure 

 considerably from all others. 



The accompanying Plate VIII. represents the different stages 

 of growth of this Parasite, all natural size. — 



Fig. 1, Uperoleia marmorala with larva on the right side of body. 



Fig. 2, Skin turned back showing the position of the larva. 



Fig. 3, Chrysalis fastened to a piece of stone. 



Fig. 4, Perfect insect. 



Fig. 5, Wing of the same. 



Fig. 6, Head of Hyla Citropus ; the cavity from which the larva emerges 



laid open. 

 Fig. 7, The larva foimd in Hyla Citropus. 



